T(n,k)=Number of nXk 0..4 arrays with every nonzero element less than or equal to some NW, E or S neighbor.

A203550

T(n,k)=Number of nXk 0..4 arrays with every nonzero element less than or equal to some NW, E or S neighbor.

Terms

    a(0) =1a(1) =1a(2) =1a(3) =1a(4) =25a(5) =1a(6) =1a(7) =430a(8) =430a(9) =1a(10) =1a(11) =4773a(12) =32920a(13) =4773a(14) =1a(15) =1a(16) =48046a(17) =1525965a(18) =1525965a(19) =48046a(20) =1a(21) =1a(22) =504464a(23) =67657718a(24) =276550270a(25) =67657718a(26) =504464a(27) =1a(28) =1a(29) =5448482

External references